问题 问答题 简答题

对煤巷的支护技术,你认为需要做哪些方面的研究工作?

答案

参考答案:

在煤巷支护方面,成功地开发和推广使用了煤巷锚杆支护技术,使煤巷锚杆支护设计、施工机具、支护材料均得到快速发展。因此,煤巷机械化掘进和锚杆支护技术己经成为煤层巷道施工的主要方法,成为我国高产高效矿井建设和生产必不可少的技术支撑。煤巷支护的特点是:支护服务年限较短;因围岩较松软,并且受采动影响,地压较大,因此要求支护具有较好的可缩性;要求原材料比较便宜,施工和维修比较容易。目前我国采区巷道的断面形状仍以梯形为主,少量为拱形。目前,以锚杆支护为主的“锚梁网”、“锚带网”或“锚带网-锚索”支护也逐渐得到普及,与金属支架支护相比,锚杆支护显著提高了巷道支护效果,降低了巷道支护成本,减轻了工人劳动强度;同时,锚杆支护简化了采煤工作面端头支护和超前支护工艺,改善了作业环境,保证了安全生产,为采煤工作面的快速推进、实现高产高效创造了良好条件。

解答题
阅读理解

阅读理解。

     Christopher Thomas, 27, was a writer by night and a teacher by day when he noticed he was always

tired and was losing weight fast. Diagnosed with diabetes (糖尿病), Thomas would need to inject himself with insulin (胰岛素) three times a day for the rest of his life or risk nerve damage, blindness, and even

death. And if that weren't bad enough, he had no health insurance.

     After a month of feeling upset, Thomas decided he'd better find a way to fight back. He left Canton,

Michigan for New York, got a job waiting tables, nicknamed himself the Diabetic Rockstar , and created

diabeticrockstar.com, a free online community for diabetics and their loved ones-a place where over

1,100 people share personal stories, information, and resources.

     Jason Swencki's son, Kody, was diagnosed with type diabetes at six. Father and son visit the online

children's forums (论坛) together most evenings. "Kody gets so excited, writing to kids from all over,"

says Swencki, one of the site's volunteers. "They know what he's going through, so he doesn't feel alone."

Kody is anything but alone: Diabetes is now the seventh leading cause of death in the United States, with

24 million diagnosed cases. And more people are being diagnosed at younger ages.

      These days, Thomas's main focus is his charity, Fight It, which provides medicines and supplies to

people-225 to date-who can't afford a diabetic's huge expenses. Fight-it.org has raised about

$23,000-in products and in cash. In May, Thomas will hold the first annual Diabetic Rockstar Festival in

the Caribbean. 

  Even with a staff of 22 volunteers, Thomas often devotes up to 50 hours a week to his cause, while still

doing his full-time job waiting tables. "Of the diabetes charities out there, most are putting money into

finding a cure," says Bentley Gubar,  one of Rockstar's original members. "But Christopher is the only

person I know saying people need help now."

1. Which of the following is true of Christopher Thomas?

A. He needs to go to the doctor every day.

B. He studies the leading cause of diabetes

C. He has a positive attitude to this disease.

D. He encourages diabetics by writing articles.

2. Diabeitcrockstar.com was created for _________.

A. diabetics to communicate                

B. volunteers to find jobs

C. children to amuse themselves              

D. rock stars to share resources.

3. According to the text, Kody ______.

A. feel lonely because of his illness              

B. benefits from diabeticrockstar.com

C. helps create the online kid's forums            

D. writes children's stories online

4. What can we learn about Fight It?

A. It helps the diabetics in financial difficulties.    

B. It organizes parties for volunteer once a year.

C. It offers less expensive medicine to diabetics.    

D. It owns a well-known medical website.

5. The last paragraph suggests that Thomas ______.

A. works full-time in a diabetes charity          

B. employs 22 people for his website

C. helps diabetics in his own way                

D. ties to find a cure for diabetes